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B&G Blog – RacePanel Series with Mark Chisnell – Part 3

B&G Blog – RacePanel Series with Mark Chisnell – Part 3

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Zeus2 series chart plotter – Setting a Race Course

Not just a simple software upgrade, more like a whole new era – combining the Zeus2 series chart plotter with an H5000 CPU and the latest product launch from B&G brings America’s Cup-level tactical software to the not-so-humble chart plotter. In this article we look at the tools provided to help you set and understand the subtleties of the race course.

Planning the summer cruise with the family or some friends can be a leisurely affair. There might be some discussions around the dinner table, perhaps a few winter evenings with the charts unrolled, tidal atlases and cruising guides out in front of the fire. And then – depending on how organised you like to be – maybe the designated navigator will set to plotting waypoints and perhaps entering them into the boat’s chartplotter.

It’s an altogether different business when the boat is going racing – perhaps the classic example is the way that Solent race courses are issued to the fleet. Waypoints can be chosen from a list of over 150 possible rounding or passing marks. The course is then read out on a specified VHF channel (and these days sometimes also sent by SMS text) informing the fleet of the marks, the order, and the side they are to be passed using a series of alphanumeric codes. It all happens once you are in sequence for the start, and it puts the navigator in ‘ticking clock’ mode as they work to understand the demands of the race course before the gun goes.

Solent racing

It’s not much easier when you are racing windward / leeward courses, when the range and bearing of the first mark can be set very late in the start sequence, and the navigator then has to reset all of the other marks – gates, spacers and so on – around the new range and bearing. In both of these, and many other cases, a really good system is required allowing fast, efficient and accurate entry of a multitude of waypoints, using different ways of describing their position.

Traditionally, waypoints are entered into a chart plotter or navigation system using latitude and longitude as coordinates. This is still the most effective way to create the necessary database of waypoints for something like Solent racing, where they are all listed in advance. The Zeus2 gives the navigator a quick and easy-to-use interface for selecting the right waypoints from the database so you can get on with worrying about strategy, and not the basics of where you are going.

Waypoint List
Unfortunately, while it’s perfect for something like Solent buoy racing, this system is not efficient when racing windward/leeward courses. Consequently, top-flight tactical navigation systems like Deckman have always provided specific tools for entering these courses. They are now available on the Zeus2 when it’s combined with the H5000 CPU. The system allows you to construct a windward/leeward course using route-points [not waypoints] via a simple dialog box for entry of the range and bearing of each mark.

Windward Leeward
The Zeus2 route-points are much more flexible than the standard waypoints in the database, and can be edited by a couple of methods. First you can re-enter a route point according to its range and bearing from your current position. And secondly, you can edit live on the chart screen after you sail around them. This is a really neat touch – you can drag the mark into the right place, by observing your virtual track as you went around the mark.

Nudge the line

It’s by far the most accurate way of getting the mark in the right place for the next time you go around it, and relieves you of the stress of trying to set the waypoint as you round the mark, when you may well be involved in actually sailing the boat and not have a hand to spare.

Once you have the route in the system, the Zeus2 will display a summary of the race course with ranges and bearings to each successive mark. This will allow you to assess all the options for each leg before you get there – choose sails, and make tactical and strategic decisions. The Zeus2 has another even more powerful tool that can assist with this process though, the What If screen – but we will look at that in our next article.

Route

Written by Mark Chisnell

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